Questions tagged [planetary-defense]

related to the defense of a planet from a major destructive event such as an impact, or searches for or studies of objects (e.g. asteroids, comets or other near earth objects) that potentially pose such a planetary threat

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52
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5answers
15k views

Does NASA have an end-of-the-world policy?

If an asteroid were detected, shooting towards earth with enough speed and certainty that it would all but guarantee a sequel of the end of the dinosaurs. Observatories and space agencies would almost ...
5
votes
2answers
919 views

Extinction asteroid (10-100 km) impact avoidance

With the present "state-of-the-art" of space technology what is possible to do to avoid an Earth impact by rocky bodies 10 km to 100 km in diameter? Is there any international project to develop a ...
2
votes
2answers
492 views

Can objects be deorbited by a satellite using a magnetic field?

Can a magnetic field be made around a satellite for a split second to gain or loose momentum from another satellite or debris with a few passes with a near-miss trajectories on larger debris? Could a ...
27
votes
2answers
1k views

How will the closure of the Arecibo dish impact deep space communications?

Earlier today, the U.S. National Science Foundation announced that it is decommissioning the Arecibo radio telescope. The 305 meter dish is famous for the 1974 message for extra-terrestrial ...